Answer:
What building has the most stories?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
I am not very commonly found! Only in some rainforest! I have an odd number of toes! I'm very lazy and hang upside down! What am I?
If you lose one of me, you are upset, bewildered, and perplexed. If you lose two of me, you are blissfully unaware. What am I?
Often cooked as fillet, this meat comes from an animal that swims underwater.